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Cummins/Onan EH41D Engine

The Cummins/Onan EH41D is a 0.4 L forced air-cooled engine, producing up to 7.3 kW. It powers generator sets from Cummins/Onan, including the PX7500.

Also known as: Cummins Onan EH41D

0.404 L
Displacement
7 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Displacement0.404 L
AspirationForced air-cooled
Gross power7 kW

Common problems

11
  • No electricity is generated at receptacle — loose connection at AC receptacle or DC terminals
    Cause: AC receptacle and DC terminals have loose connection
    Fix: Secure connection if necessary
  • No electricity is generated at receptacle — engine starting attempted with appliances already connected
    Cause: Engine starting was attempted with appliances already connected to generator
    Fix: Turn off switch on the appliance, and disconnect cable from receptacle; Reconnect after generator has been started properly
  • No electricity is generated at receptacle — AC circuit breaker not in the "ON" position
    Cause: AC circuit breaker is not in the "ON" position
    Fix: After making sure that the total wattage of the electrical appliance is within permissible limits and there are no defects in the appliance, turn the AC circuit breaker to the "ON" position; If breakers continue to actuate, consult your nearest servicing dealer
  • Low power
    Cause: Carbon brushes are excessively worn
    Fix: Check the brush every 500 hours or if generator performance is irregular; If the brush is 5 mm long or less, replace it with a new one
  • Engine fails to start — loose spark plug cap
    Cause: Spark plug cap is loose
    Fix: If loose, push spark plug cap back into place
  • Engine fails to start — generator connected to an appliance
    Cause: Generator is connected to an appliance
    Fix: If connected, turn off the power switch on the connected appliance and unplug
  • Engine fails to start — fuel level low
    Cause: Fuel level is low
    Fix: If empty, refill fuel tank making sure not to overfill
  • Engine fails to start — fuel cock closed
    Cause: Fuel cock is closed
    Fix: If closed, open fuel cock
  • Engine fails to start — engine switch in OFF
    Cause: Engine switch is in OFF
    Fix: Turn engine switch to ON
  • Engine fails to start — contaminated spark plug
    Cause: Spark plug is contaminated
    Fix: Remove spark plug and clean electrode
  • Engine fails to start — choke lever not in its proper position
    Cause: Choke lever is not in its proper position
    Fix: Set the choke lever to "CLOSE" position

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan EH41D.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—50 hr
Fuel filter—
Oil filter—
Battery—
Belt—
Coolant—
Oil4-stroke automotive detergent oil of API service class SE or higher grade (SG, SH or SJ is recommended). SAE 10W-30 or 10W-40 is recommended for general, all-temperature use.1.3 Quart—100 hr
Spark plug—500 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the displacement of the Cummins/Onan EH41D?

The Cummins/Onan EH41D has a displacement of 0.404 liters.

Which generators use the Cummins/Onan EH41D engine?

The Cummins/Onan EH41D powers 1 generator set(s), including Cummins/Onan PX7500.

How often should you change the oil in the Cummins/Onan EH41D?

The Cummins/Onan EH41D oil change interval is every 100 hours.

What is a common problem with the Cummins/Onan EH41D engine?

A commonly reported issue on generators using the Cummins/Onan EH41D is: No electricity is generated at receptacle — loose connection at AC receptacle or DC terminals. Cause: AC receptacle and DC terminals have loose connection. Fix: Secure connection if necessary.